Cooler for engines



Feb. 6, 1945. A. s. F. WALLGREN v 2,368,732

COOLER FOR ENGINES Filed Oct. '23, 1940 2 Sheets-Sheet l za 3g /7 i a $7 r/ II I /5 40 \j s Fig.2 Q I k /6 l5 /0 /g M I 2/ Q s ,6 If 77 s I INVENTOR M aATTORNEY 2 Sheets-Sheet 2 3 r I \l:

Feb; 6, 1945.

A. G. F. WALLGREN COOLER FOR ENGiNES Filed Oct. 2:5, 1940 Patented Feb. 6, 1945 COOLER roa enemas August Gnnnar Ferdinand Wallgren, Eskilstuna,

Sweden, assignor to Aktieliolaget Bolinder- Munktell, Eskilstuna, Sweden, a corporation of Sweden Application oeteber 23, 1940, Serial 'In' Sweden-November 18, 1939 I 1 Claim. This invention refers to radiators for engines,

mofi parti-cularly internal combustion motors, in:

which the ultimate cooling medium consists of a liquid or of air. The radiator is intended to be used for the cooling of water circulating through the engines as well as of oil, for example.

One object of the invention is to provide a radiator having high values of heat transmission between the various media and the walls of the media through the radiator and thus'the sacrifice of energy in the functioning of the radiator is low. Another object of the invention is to provide a radiator which, while being of sinall dimensions, is capable of carrying 011 large quantitles of heat from the medium heated by the.

at their opposite ends with ear-shaped projections, the projections at one end'being diagonally disposed with relation to the projection at the other end. The projections adjacent to the radially outer edges of the plates are formed' withopenings or holes while the projectionsadjacent to the radially inner edges have openings or holes 16 therethrough. As shown in Fig; 2, the

' radiator, while the resistance to the flow of the lo motor, such as water 'or oil. Further objects of the invention are to provide a radiator which is of a stable and sturdy construction so as not to be e v ,7 in. damaged by thevlbrations of the motor or by anymm of bolts zfpgssinfthrougfithe holes external strains, and which from a manufacturing point of view shows great advanta ges by a rational and simple construction.

Further objects and. advantages of the invention will-be apparent from the following description considered in connection with the accompanying drawings which form a part of this speciflcatiomand of which:

Fig. 1 is a longitudinal section taken on the line I-I of Fig. 2 through a radiator constructed in accordance with the invention, said radiatoroperating with air as a cooling medium; and

Fig. 2 is a section taken on the'line 11-11 of Fig. 1; w Figs. 3 and 4 show sections taken on the lines IIIIII and IV-IV of Fig. 2, respectively, on an enlarged scale. 7 I

In the embodiment according to Figs. 1-4, It" designates a fan wheel having impeller blades l2, the hub H of which is preferably adapted to be arranged directly on the crank shaft of a motor. A ring of stationary guide blades it may be provided outside the fanwheel to impart the desired direction of flow to the air. -'I'he radiator proper is arranged radially outside the fan wheel in and the blade ring 13. The radiator consists of sheet units are preferably so arranged that the inner and outer projections of the plates overlap in pe-' ripheral direction, and hence the openings l5 and IS in the adjacent ends of adjacent units are located on the sameradial'line from the centre of the fan wheel, the row of holes It being then innermost. The sheet metal units are arranged between two disks I! and I8 which are preferably provided with openings I9 and 20. respectively, in alignment with the holes l5 and IS. The plates u are clamped between the disks l1 andJLby and IS in the platesand the openings I 9 and 20 in the disks. .The liquid to be cooled, such as water or oil, enters through a pipe connection 22 to the two uppermost rows of holes l5, and escapes through another pipe connection 23 adjacent the l two lowermost rows of holes IS. The two pipe n connections may be provided diametrically op posite' one another. e

There are spaces between the sheet metal plates of the various units, alternate spaces being traversed by the cooling air and intermediate spaces traversed by the hot liquid from the motor entering through the pipe connection 22. In order to separate the different fluid spaces from one another, the holes I! and 18. are surrounded by one or more rings .or washers 24 which also serve as distance pieces for the spaces 25 through which the air passes. These rings permit free passage of the air outwardly from the fan outlet. The spaces 26 between the plates intended for the liquid are laterally closed by frame-like packings 21 which have similar outer contours as the plates I4 and consequently also extend about the holes l5 and Hi. The packing elements 24' and 21 may'consist metal plates 14 disposed in planes at right angles of metal, and may be welded to the plates, for in-- stance'by seam or spot welding. Consequently the various paths of u are separated from each otherin a fluid-tight fashion, and furthermore, the plate units attain a stable and sturdy shape. Packing members 30 may be inserted between two" adjacent plate units,

7 especially the two uppermost and lowermost units in Fig. 2, in order to prevent outward flow of the cooling air at these points.

The sheet metal plates are corrugated and flow within the plate units 7 holes 6 to a circular channel 28, which may be the collecting channel 28 through th holes transmission is obtained between the airand the exchanging media is ensured, and at the same time the resistance to flow is small. By reason of the low resistance in the air passages of the cooler, the fan will have to compress the air to a small extent only, for instance to a pressure corresponding to a water column of 10- 20 mm. According to the invention, the requisite quantity of air may be obtained without the fan being geared up to rotate faster than the crank shaft, the fan being then preferably arranged directly on the shaft of the motor. The radiator in its entirety will be of small dimensions and have a small diameter. As the air is blown through the radiator, the turbulence is greater than when the air is' sucked through the same.

Obviouslyfthe invention is not limited to the embodiments above described, but may be vari the corrugations extend on both sides of the plane of the edge portion and have an extent beyond this plane of 2 mm., for example. Preferably, the corrugations of two plates forming an air passage are placed so that the passage is of substantially 5 uniform thickness in the path of thecooling air, that is to say the corrugations of thetwo plates here extend in parallel relationship. On the other hand, the water spaces 26 are bounded by plates with the corrugations disposed in a crosswise fashion (see 50 in Fig. 2), which results in the 1 spaces having a varying thickness. The corrugations of the various plates may extend at an in-' clination to planes through the centre of the radiator. Two sheet metal plates forming a space 26 may contact each other at points; as will be seen from Fig. 4.

flThe hotlgid entering through the conduit 22 in many respects wit r mg from the on. In the embodiment shown flows in the embeamrenvimsnasemi l rww of holes i5 pertainingto the two uppermos plate the channels 28 and 29 may be separated, if deunits in Fig. 2. From here, a portion of the liquid sired, by a heat-insulating. wall, or, they may he passes through the spaces 26 between the plates, arranged each on one side of the cooler to counterwhere it is cooled by the transmission of heat act heat transmission between the same". through the plates to the air flowin through the What I claim is: spaces 25, and thence escapes through the rows of In a radiator, a plurality of spaced sheet metal v plates having flat edge portions extending peformed by the disk 18 and an annular element 29 arranged outside the same. Another portion of the hot liquid continues straight through the said tions, said flat edge portions being formed with fluid distributing openings at spaced apart locarows of holes I5into anan nular channei39'which30 tions, packing frames between adjacent plates is preferablyprovided in the same manner as the taken in pairs for forming fluid-tight chambers channel 28. The hot liquid follows the channel therebetween;packingeringswetweemadjwpt 39 in both directions to the lower units and enters plates of adjacent pairs and in alignment with said into the latter through the holes I5. Thereafter, openings for providing air spaces between said the liquid, after having been cooled, escapes to pairs and fluid connections between said chaml6. bers, said adjacent plates which bound opposite The cooled liquid is led ofi through the two lowersides of the airspaces being arranged with their most rows ofholes IE to the connection 23. respective corrugations parallel and the plates of According to the invention, very high heat each pair which bound opposite sides of the fluid chamber being disposed with their respective corrugations in angular relation,

= AUGUST GUNNAR FERDINAND WALLGREN.

plates on the one 'haiidIa-n'd between the liquid and the plates on the other hand. In both instances a well balanced turbulence of the heat- -r ripherally therearour d and undulated inner por- 

